gd library php install code example

Example 1: install gd extension php ubuntu

#install gd extension, 7.4 replace it with your version
sudo apt-get install php7.4-gd
#check if installed
php -m | grep gd
#restart your web server 
sudo service apache2 restart
or
sudo service nginx restart

Example 2: Install or enable PHP's gd extension

apt-get install php-gd